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Vgs exceeding in the PSS analysis

MohsenShah

I am doing PSS analysis to calculate the THD. I ran the simulation for all blocks separately and everything is fine, but when I place then as a chain, I receive a Vgs exceeding warning. I checked everything and nothing look odd but the Vgs goes to higher than 20 V while the supply voltage is less than 5 V. Surprisingly, I do not get this warning when I do the Transient simulation with the exact same setup. Has anyone faced this problem before?

My cadence version: IC6.1.6-64b.500.6

Thanks!

  • Andrew Beckett

    Not enough information to be able to diagnose this - my guess is that maybe your PSS is struggling to converge and so is moving into invalid regions in the models. You may need to provide a longer tstab, but this is purely guesswork. Providing the spectre output log file would make it a little easier to understand and possibly give some better advice. It's likely to be a specific problem with your design and the simulator rather than a generic solution which others have faced before - especially without seeing the actual messages output by the simulator.

    Regards,

    Andrew.

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